Match each term with its definition. A. a sequence of DNA located upstream of a gene that signals the start of transcription
B. a transcription factor that prevents mRNA synthesis by binding to the operator of a gene
C. a transcriptional element that blocks the signal between enhancers and promoters
D. a gene that controls the expression of one or more genes by promoting or inhibiting transcription
E. a small molecule that activates transcription by inhibiting the action of a repressor protein
F. a short DNA sequence that can be recognized by a repressor protein
1. Inducer
2. Operator
3. Repressor
4. Promoter
5. Insulator
6. Regulatory gene